Sheffield councillors will be asked to formally oppose plans to close a mail office in the city at their next full meeting.
Royal Mail is considering the possibility of relocating Sheffield South West delivery office on Ecclesall Road to the city centre.
It says no decision has yet been made and that staff are being consulted.
Hundreds of people have already signed an online petition against the proposals and say the delivery office is a vital facility for the community.
Now a motion submitted to Sheffield Council’s full meeting next Wednesday, October 7, asking for the council to oppose the plans.
Ecclesall councillors say elderly and disabled people would find it difficult to get to the city centre to collect their parcels if the office closed.
Coun Roger Davison said: “Having to use Pond Street would be far less convenient.”
There will be no compulsory redundancies if the plan does go ahead.
Royal Mail says the proposal is part of its plans to change the business as fewer people send letters and more firms deliver parcels.
A spokesman added: “Whenever a delivery office move goes ahead, we always consider alternative parcel pick up facilities and offer customers alternative ways to receive undelivered items, including delivery to a neighbour, re-delivery or delivery to another address.”